Addition of mineral acid to an aqueous solution of Borax, the compound formed is:

Puroboric acid

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Boron hydride

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Meta boric acid

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Orthoboric acid

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Solution

The correct option is D Orthoboric acid
Addition of mineral acid to an aqueous solution of Borax, orthoboric acid is formed.

$N a_{2} B_{4} O_{7} + 2 H C l + 5 H_{2} O \to 4 H_{3} B O_{3} + 2 N a C l$

Hence, the correct answer is option $D$ .

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